I would say its the tiny radiator. A dual 80mm radiator sounds big, but it can easilly be outperformed by a single 120mm radiator with a decent fan. You might want to consider putting some higher CFM fans on that radiator, but I doubt it will help much. The heat put into the system by the CPU and GPU, not to mention the northbridge chip is more than likely pushing that radiator to its limit.
All things being equal, it is most likely the radiator thats giving you higer temps. This is assuming your tubing isnt crimped and you are giving the radiator nice cool outside air, etc...
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.: || P4 2.8 800 @ 3.8 || Gigabyte 8KNXP || 1 Gig Crucial PC3200 || ATI 9800 PRO 128 || 2x WD 250GB RAID 0 || :.
.: || Danger Den RBX, Zchip, and Maze4 GPU || Black Ice Xtreme || Eheim 1250 || DD Fillport || :.
.: || Antec TrueBlue 480 || Modded Lian-Li PC65 || :.
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